检索结果-南通市图书馆

Real-time litchi detection in complex orchard environments: A portable, low-energy edge computing approach for enhanced automated harvesting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Artificial Intelligence in Agriculture 2024年第1期11卷 13-22页

作者： Zeyu Jiao Kai Huang Qun Wang zhenyu zhong Yingjie Cai Guangdong Key Laboratory of Modern Control Technology Institute of Intelligent ManufacturingGuangdong Academy of SciencesGuangzhouChina School of Economics and Management Beihang UniversityBeijingChina Department of Electronic Engineering The Chinese University of Hong KongHong Kong

Litchi,a succulent and perishable fruit,presents a narrow annual harvest window of under two *** advent of smart agriculture has driven the adoption of visually-guided,automated litchi harvesting ***,conventional approaches typically rely on laboratory-based,high-performance computing equipment,which presents challenges in terms of size,energy consumption,and practical application within litchi *** address these limitations,we propose a real-time litchi detection methodology for complex environments,utilizing portable,low-energy edge computing ***,the litchi orchard imagery is collected to enhance data ***,a convolutional neural network(CNN)-based single-stage detector,YOLOx,is constructed to accurately pinpoint litchi fruit locations within the *** facilitate deployment on portable,low-energy edge devices,we employed channel pruning and layer pruning algorithms to compress the trained model,reducing its size and ***,the knowledge distillation technique is harnessed to fine-tune the *** findings demonstrated that our proposed method achieved a 97.1%compression rate,yielding a compact litchi detection model of a mere 6.9 MB,while maintaining 94.9%average precision and 97.2%average *** 99 frames per second(FPS),the method exhibited a 1.8-fold increase in speed compared to the unprocessed ***,our approach can be readily integrated into portable,low-computational automatic harvesting equipment,ensuring real-time,precise litchi detection within orchard settings.

关键词： Litchi detection Automated harvesting Edge computing Neural networks Model compression

No correlation between neonatal fitness and heterozygosity in a reintroduced population of P^re David＇s deer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Current Zoology 2013年第2期59卷 249-256页

作者： Yan ZENG Chunwang LI Linyuan ZHANG zhenyu zhong Zhigang JIANG Key Laboratory of Animal Ecology and Conservation Biology Institute of Zoology Chinese Academy of Sciences Beijing 1 O0101 China Beijing Milu Ecological Research Center Beijing 100076 China

Considering the severe impacts of genetic bottlenecks and small numbers of founders in populations of reintroduced animals, it is necessary to study inbreeding and its effect on fitness in species of conservation concern. Pere David＇s deer is one of few large mammal species extinct in the wild but safely preserved in captivity. Its specific background gives us the opportunity to study the relationships between heterozygosity and neonatal fitness in relocated populations. We employed five microsatellite loci to explore heterozygosity-fitness correlations in a population of Pere David＇s deer at the Beijing Milu Ecological Research Center. We observed associations between microsatellite-based variables sMLH, IR, MD^2 and HL, and two components of fitness ex- pressed early in life （birth weight and the neonatal mortality of 123 Pere David＇s deer calves born over six consecutive years）. We found that neonatal mortality was 19.1% - 7.6%, not higher than the 19% or 18% reported in other ungulates. The heterozygosity of calves was not associated with neonatal mortality, nor birth weight. Our study implies that low genetic variability of microsa- l：ellite loci has no overt effect on birth weight and neonatal mortality in reintroduced populations of P^re David＇s deer [Current Zoology 59 （2）： 249-256, 2013].

关键词： Elaphurus davidianus Birth weight Neonatal mortality Founder effect Inbreeding depression

Accurate and rapid image segmentation method for bayberry automatic picking via machine learning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2023年第6期16卷 246-254页

作者： Huan Lei Chentong Li Yu Tang zhenyu zhong Zeyu Jiao Institute of Intelligent Manufacturing Guangdong Academy of SciencesGuangzhou 510070China Guangdong Key Laboratory of Modern Control Technology Institute of Intelligent ManufacturingGuangdong Academy of ScienceGuangzhou 510070China School of Automation Guangdong Polytechnic Normal UniversityGuangzhou 510665China

Due to the short ripening period and complex picking environment,bayberry generally relies on mechanical equipment for picking,especially the automatic picking system guided by ***,it is crucial to locate the bayberry in the view accurately and *** efforts have been made,the existing methods are difficult to implement due to the limited amount of data and the processing *** this study,an accurate and rapid segmentation method based on machine learning was proposed to address this ***,the images collected by the visual guidance system were pre-processed by contrast-limited adaptive histogram equalization(CLAHE)based on the Y component of the YUV color *** advantage of the color difference map of RB and RG for the segmentation of different colors,an adaptive color difference map foreground segmentation method was then adopted for bayberry region foreground ***,distance transforms and marking control watershed methods were exploited to achieve single bayberry fruit ***,with the help of the convex hull theory and fruit shape characteristics,the irregular background interference areas were filtered out,which improved the accuracy of bayberry segmentation *** experimental results show that this method can achieve better segmentation of bayberry in complex orchard environment with an accuracy of 97.4%and only takes 0.136 s to calculate once.

关键词： bayberry image segmentation machine learning automatic picking computer vision

Comprehensive evaluation of heavy metal contamination of sediment in Lake Dianchi by using modified AHP method and ^(137)Cs dating

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2008年第3期2卷 370-379页

作者： Yan ZHANG Xiang GAO zhenyu zhong Xihai DENG Buzhuo PENG School of Geographic and Oceanographic Sciences Nanjing UniversityNanjing 210093China State Key Laboratory of Soil Sustainable Agriculture Institute of Soil SciencesChinese Academy of SciencesNanjing 210008China

Through the use of general sampling and measurement by ^(137)Cs dating,problems regarding the absence of monitoring data can easily be ***,weighted values need to be determined while Environment Quality Comprehensive Index(EQCI)is commonly used as applied in environmental quality comprehensive *** order to overcome the subjectivity in determining weights,the modified Analytical Hierarchy Process(AHP)method was *** modified AHP method involved the following key procedures:First,the parameters y_(i1) and y_(i2) were calculated based on the monitoring data;second,the factors were put in order according to the symbol and value of y_(i1) and y_(i2);third,the continuous odd integers,which represented the importance of factors,were given to factors according to their seating order;and,fourth,the factor weights were determined from the pair-wise comparison matrix calculated by the ratio of the given odd ***,the weights were completely based on the monitoring *** the present study,the comprehensive quality of sediments in five sections of Lake Dianchi were evaluated and the results indicated that the current contamination of sediments in each lake section is much more serious than at any other time in history.

关键词： ^(137)Cs dating modified AHP method environment quality comprehensive evaluation heavy metal contamination of sediment Lake Dianchi

3D micropattern force triggers YAP nuclear entry by transport across nuclear pores and modulates stem cells paracrine

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2023年第8期10卷 180-193页

作者： Yan Li zhenyu zhong Cunjing Xu Xiaodan Wu Jiaqi Li Weiyong Tao Jianglin Wang Yingying Du Shengmin Zhang Advanced Biomaterials and Tissue Engineering Center Huazhong University of Science and Technology Department of Biomedical Engineering Huazhong University of Science and Technology Research Base of Regulatory Science for Medical Devices National Medical Products Administration&Institute of Regulatory Science for Medical Devices Huazhong University of Science and Technology

Biophysical cues of the cellular microenvironment tremendously influence cell behavior by mechanotransduction. However, it is still unclear how cells sense and transduce the mechanical signals from 3D geometry to regulate cell function. Here, the mechanotransduction of human mesenchymal stem cells(MSCs) triggered by 3D micropatterns and its effect on the paracrine of MSCs are systematically investigated. Our findings show that 3D micropattern force could influence the spatial reorganization of the cytoskeleton, leading to different local forces which mediate nucleus alteration such as orientation,morphology, expression of Lamin A/C and chromatin condensation. Specifically, in the triangular prism and cuboid micropatterns, the ordered F-actin fibers are distributed over and fully transmit compressive forces to the nucleus, which results in nuclear flattening and stretching of nuclear pores, thus enhancing the nuclear import of YES-associated protein(YAP). Furthermore, the activation of YAP significantly enhances the paracrine of MSCs and upregulates the secretion of angiogenic growth factors. In contrast, the fewer compressive forces on the nucleus in cylinder and cube micropatterns cause less YAP entering the *** skin repair experiment provides the first in vivo evidence that enhanced MSCs paracrine by 3D geometry significantly promotes tissue regeneration. The current study contributes to understanding the in-depth mechanisms of mechanical signals affecting cell function and provides inspiration for innovative design of biomaterials.

关键词： bioactive materials tissue regeneration 3D micropattern force paracrine mechanotransduction

Zn/Sr dual ions-collagen co-assembly hydroxyapatite enhances bone regeneration through procedural osteo-immunomodulation and osteogenesis

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Bioactive Materials 2022年第4期7卷 195-206页

作者： zhenyu zhong Xiaodan Wu Yifan Wang Mengdie Li Yan Li XuLong Liu Xin Zhang Ziyang Lan Jianglin Wang Yingying Du Shengmin Zhang Advanced Biomaterials and Tissue Engineering Center Huazhong University of Science and TechnologyWuhan430074China Department of Biomedical Engineering Huazhong University of Science and TechnologyWuhan430074China Institute of Regulatory Science for Medical Devices Huazhong University of Science and TechnologyWuhan430074China Department of Biomedical Engineering The University of Texas at AustinAustinTX78712USA

The immune microenvironment induced by biomaterials played vital roles in bone ***(HA)and its ion-substituted derivates represent a large class of core inorganic materials for bone tissue *** ion substitution was proved to be a potent way to grant HA more biological functions,few studies focused on the immunomodulatory properties of ion-doped ***,to explore the potential osteoimmunomodulatory effects of ion-doped HA,zinc and strontium co-assembled into HA through a collagen template biomimetic way(ZnSr-Col-HA)was successfully *** was found that ZnSr-Col-HA could induce a favorable osteo-immune microenvironment by stimulating ***,ZnSr-Col-HA demonstrated a procedural promoting effect on osteogenic differentiation of bone marrow mesenchymal stem cells(BMSCs)in ***,the osteo-immune microenvironment acted as a dominant factor in promoting osteogenic gene expressions at the early stage through OSM signal *** the direct stimulating effects on BMSCs by Zn^(2+)/Sr^(2+) were more effectively at the later stage with Nfatc1/Maf and Wnt signals *** vivo study confirmed strong promoting effects of ZnSr-Col-HA on critical-sized cranial defect *** current study indicated that such a combined biomaterial design philosophy of dual ion-doping and biomimetic molecular co-assembly to endow HA applicable osteoimmunomodulatory characteristics might bring up a new cutting-edge concept for bone regeneration study.

关键词： Hydroxyapatite Zinc Strontium Biomimetic co-assembly Osteoimmunomodulation

考虑风重耦合效应的超高层建筑横风向随机风振响应

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

建筑结构学报 2016年第10期37卷 108-115页

作者：钟振宇楼文娟浙江工业职业技术学院浙江绍兴312000 浙江大学建筑工程学院浙江杭州310058

超高层建筑结构侧向刚度较小,风荷载作用下结构水平位移较大,重力作用则进一步加大水平位移,该现象称为风重耦合效应。横向风荷载由于作用机理的复杂性,其风重耦合效应问题关系到结构安全性。建立计入重力影响的结构动力方程,利用等效... 详细信息

超高层建筑结构侧向刚度较小,风荷载作用下结构水平位移较大,重力作用则进一步加大水平位移,该现象称为风重耦合效应。横向风荷载由于作用机理的复杂性,其风重耦合效应问题关系到结构安全性。建立计入重力影响的结构动力方程,利用等效线性法,可求解横风向激励下的随机风振响应。结果表明:重力刚度比是一个决定性因素,当平均风速较小时,结构位移响应随着该参数值增长而增长;而当平均风速加大时,结构位移响应随着其增长先增大后下降。对于矩形截面的超高层建筑,当深宽比小于2时,横向风荷载与重力耦合效应先随深宽比减小而后增大。横风向的风重耦合效应作为一个重要因素必须在超高层建筑结构设计中加以考虑。

关键词：超高层建筑风重耦合效应非线性振动横向风随机风振响应

Albumin-assembled copper-bismuth bimetallic sulfide bioactive nanosphere as an amplifier of oxidative stress for enhanced radio-chemodynamic combination therapy

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Regenerative Biomaterials 2022年第1期9卷 585-596页

作者： Weiyong Tao Zhan Tuo Feige Wu Ketao Mu Cunjing Xu Yuxiao Shi Zeyu Sun Yifan Wang Yan Li zhenyu zhong Lei Zhou Jianglin Wang Jie Liu Yingying Du Shengmin Zhang Advanced Biomaterials and Tissue Engineering Center Huazhong University of Science and TechnologyWuhan 430074China NMPA Research Base of Regulatory Science for Medical Devices&Institute of Regulatory Science for Medical Devices Huazhong University of Science and TechnologyWuhan 430074China Department of Biomedical Engineering Huazhong University of Science and TechnologyWuhan 430074China Cancer Center Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China Department of Radiology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China School of Biomedical Engineering Sun Yat-sen UniversityGuangzhouGuangdong 510006China

The tumor microenvironment with overexpressed hydrogen peroxide(H_(2)O_(2))and reinforced antioxidative system(glutathione,GSH)becomes a double-edged sword for the accessibility of *** reactive oxygen species(ROS)are easily quenched by the developed antioxidative network,ROS-based treatments such as chemodynamic therapy(CDT)and radiotherapy(RT)for killing cancer cells are severely *** overcome such limitations,a bioactive nanosphere system is developed to regulate intracellular oxidative stress for enhanced radio-chemodynamic combination therapy by using bovine serum albumin(BSA)based bioactive nanospheres that are BSA assembled with in situ generated copper-bismuth sulfide nanodots and diallyl trisulfide(DATS).The copper-bismuth sulfide nanodots react with H_(2)O_(2)to produce·OH and release Cu^(2+).Then,the Cu^(2+)further depletes GSH to generate Cu^(+)for more·OH generation in the way of Fenton-like *** a cascade reaction can initiate·OH generation and GSH consumption to realize *** elevation of ROS triggered by the DATS from BBCD nanospheres further augments the breaking of redox balance for the increased oxidative stress in 4T1 *** the sensitization of increased oxidative stress and high Z element Bi,an enhanced radio-chemodynamic combination therapy is *** current work provides an enhanced radio-chemodynamic combination treatment for the majority of solid tumors by using the co-assembled bioactive nanospheres as an amplifier of oxidative stress.

关键词： bioactive materials nanosphere assembly bismuth-copper radio-chemodynamic therapy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

计入风重耦合效应高耸结构顺风向响应分析

哈尔滨工程大学学报 2015年第6期36卷 765-768页

作者：钟振宇楼文娟浙江工业职业技术学院建筑工程学院浙江绍兴312000 浙江大学建筑工程学院浙江杭州310058

风重耦合效应是指高耸结构侧向变形受到风和重力共同影响而引起结构静力和动力响应发生变化的现象。为了研究风重耦合效应的作用机理,利用结构几何非线性动力方程和等效线性随机振动理论求解。计算结果表明,重刚比是影响风重耦合效应最... 详细信息

风重耦合效应是指高耸结构侧向变形受到风和重力共同影响而引起结构静力和动力响应发生变化的现象。为了研究风重耦合效应的作用机理,利用结构几何非线性动力方程和等效线性随机振动理论求解。计算结果表明,重刚比是影响风重耦合效应最重要的参数,其值越大,结构振动固有频率越小,结构响应越大。当结构重刚比较小时,地面粗糙度、结构固有阻尼和平均风速对风重耦合效应影响不大。当重刚比较大时,风重耦合效应随结构固有阻尼和平均风速的增大而减小。

关键词：超高层建筑风重耦合效应风振非线性振动